Coil-based artificial atom for metamaterials, metamaterial comprising the artificial atom, and device comprising the metamaterial
Provided are an artificial atom of a metamaterial by coiling up space, a metamaterial including the artificial element, and a device including the metamaterial. The artificial atom of the metamaterial by coiling up space includes a first coiling unit that coils up a first space and a second coiling unit that coils up a second space and that is connected with the first coiling unit.
1. An artificial atom forming a metamaterial, comprising:
a first coiling unit comprising first channels that are parallel to each other and arranged in a first direction, one of the first channels being an output channel which outputs a wave propagating through the first channels to a point; and
a second coiling unit connected with the first coiling unit and comprising second channels that are parallel to each other and arranged in a second direction different from the first direction, one of the second channels being an input channel which inputs a wave propagating through the second channels from the point.
2. The artificial atom forming a metamaterial of claim 1 , wherein the wave in at least one of the first coiling unit and the second coiling unit propagates along a zigzag path.
3. The artificial atom forming a metamaterial of claim 2 , wherein the first channels are connected in series.
4. The artificial atom forming a metamaterial of claim 3 , wherein wave propagation directions of neighboring channels in the first channels are different.
5. The artificial atom forming a metamaterial of claim 3 , wherein neighboring channels of the first channels are separated by a plate.
6. The artificial atom forming a metamaterial of claim 3 , wherein each of the first channels has a width that is smaller than a wavelength of the wave propagating through the first channels.
7. The artificial atom forming a metamaterial of claim 3 , wherein the first channels of the first coiling unit and the second channels of the second coiling unit are connected to each other in series.
8. The artificial atom forming a metamaterial of claim 1 , wherein the waves are at least one of an acoustic wave, an electromagnetic wave, and an elastic wave.
9. The artificial atom forming a metamaterial of claim 1 , wherein at least one of the first coiling unit and the second coiling unit are coiled up in at least one of two or three dimensions.
10. The artificial atom forming a metamaterial of claim 1 , wherein the first coiling unit and the second coiling unit are connected to each other at the point and the first coiling unit and the second coiling unit are rotationally symmetric about the point.
11. The artificial atom forming a metamaterial of claim 1 , wherein the first coiling unit and the second coiling unit are anisotropic.
12. The artificial atom forming a metamaterial of claim 1 , wherein the first coiling unit and the second coiling unit are isotropic.
13. The artificial atom forming a metamaterial of claim 1 , further comprising:
a third coiling unit that is connected with the first coiling unit and the second coiling unit; and
a fourth coiling unit that is connected with the first coiling unit, the second coiling unit, and the third coiling unit.
14. The artificial atom forming a metamaterial of claim 13 , wherein the first coiling unit, the second coiling unit, the third coiling unit, and the fourth coiling unit are interconnected to each other at the point which is at a center of the artificial atom.
15. The artificial atom forming a metamaterial of claim 13 , wherein the artificial atom is isotropic.
16. The artificial atom forming a metamaterial of claim 13 , wherein a refractive index of the artificial atom is proportional to a length that one of the waves propagates through the artificial atom.
17. The artificial atom forming a metamaterial of claim 16 , wherein the refractive index is 4 or more.
18. The artificial atom forming a metamaterial of claim 13 , wherein at least one of an effective density and effective bulk modulus of the artificial atom with regard to a wave of a specific frequency band is negative.
19. The artificial atom forming a metamaterial of claim 18 , wherein a refractive index with regard to the wave of a specific frequency band is negative.
20. The artificial atom forming a metamaterial of claim 13 , wherein a lattice constant of the artificial atom is smaller than a wavelength of one of the waves.
21. The artificial atom forming a metamaterial of claim 13 , wherein the third coiling unit and the fourth coiling unit are rotationally symmetric based on the point connecting the third coiling unit and the fourth coiling unit to each other.
22. The artificial atom forming a metamaterial of claim 1 further comprising a third coiling unit that is connected with the first coiling unit and the second coiling unit, wherein the first coiling unit, the second coiling unit, and the third coiling unit are rotationally symmetric to each other about the point.
23. A metamaterial formed of a plurality of the artificial atom of claim 1 .
24. The metamaterial of claim 23 , wherein the plurality of the artificial atom are formed in at least one of one dimension, two dimensions, and three dimensions.
25. A lens comprising the metamaterial of claim 23 , wherein the lens is configured to change characteristics of an incident wave by the metamaterial.
26. An artificial atom forming a metamaterial, the artificial atom comprising:
an inlet configured to receive an incident wave;
an outlet configured to output the incident wave; and
a coiling unit configured to propagate the incident wave along a zigzag path from the inlet toward the outlet,
wherein a refractive index of the artificial atom is proportional to a length of the zigzag path.
27. The artificial atom forming a metamaterial of claim 26 , wherein the coiling unit comprises a plurality of channels connected in series through which the incident wave propagates.
28. The artificial atom forming a metamaterial of claim 27 , wherein a vector sum of wave propagations is proportional to propagation directions of the incident wave from the inlet to the outlet.
29. An artificial atom forming a metamaterial comprising:
an inlet configured to receive an incident wave;
an outlet configured to output the wave; and
a coiling unit that is connected from the inlet to the outlet and configured to propagate the wave along a path from the inlet to the outlet,
wherein a length of the path in the coiling unit is longer than a straight-line distance between the inlet and the outlet, and
wherein a refractive index of the artificial atom is proportional to the length of the path.